A laying head of a carbon fiber tape laying machine

Abstract

The present invention discloses a laying head of a carbon fiber tape laying machine, which includes a conveying device and a rolling device; the rolling device includes at least one flexible rolling device; the flexible rolling device includes an internal liquid flexible bag and a flexible bag adjustment device, and the flexible bag adjustment device can adjust the shape and pressure of the contact portion between the flexible bag and the carbon fiber tape; the flexible rolling device is used to fix the fiber laying to a specified position. A laying method for the laying head of a carbon fiber tape laying machine is also provided. The present invention uses a flexible bag to replace the traditional laying roller. Compared with the traditional laying roller, the flexible bag can better fit the surface of the core mold. At the same time, the liquid inside the flexible bag can make the flexible bag have a certain toughness, so that the carbon fiber tape can better fit the surface of the core mold. By adjusting the flexible bag moving device, the pressure between the flexible bag and the core mold can be controlled to ensure stable pressure during the laying process of the fiber tape.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber tape production, in particular to a placing head of a carbon fiber tape placing machine. Background Art

[0002] Composite materials are formed by combining multiple single materials. Carbon fiber composite materials are increasingly used in engineering. Carbon fiber modules are manufactured from carbon fiber tape through a series of processes including conveying, heating, pressing, shearing, and re-feeding.

[0003] Automated fiber placement (AFP) technology was developed in the 1980s, and since then, automated placement machines have been developed and put into use both domestically and internationally. Currently, the key technical limitation for thin-walled carbon fiber tape placement in China lies in the control accuracy of the core "sticking-cutting-refeeding" process of the carbon fiber tape placement head. Therefore, technological development is crucial for the development of thin-walled carbon fiber tape placement technology in China. Currently, most applied research focuses on large, low-curvature, thin-walled structures, while research on the placement of small, complex, free-form, thin-walled structures is limited. Key technologies include placement system design, placement temperature control, refinement of placement path planning algorithms, and ensuring placement platform accuracy. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that most of the existing composite material placement machines on the market have low accuracy in grabbing multi-layer fiber cloths during use and low accuracy in laying small-sized complex free-form surface thin-walled structures, and to provide a placement head for a carbon fiber tape placement machine.

[0005] A laying head of a carbon fiber tape laying machine includes a conveying device and a rolling device; the rolling device includes at least one flexible rolling device; the flexible rolling device includes an internal liquid flexible bag and a flexible bag adjustment device, and the flexible bag adjustment device can adjust the shape and pressure of the contact area between the flexible bag and the carbon fiber tape; the flexible rolling device is used to fix the fiber laying to a specified position.

[0006] The bag body of the flexible bag is strip-shaped, and its longitudinal section is gourd-shaped; the upper part is fixed on a fixing clamp; and the fixing clamp is installed at the output end of the flexible bag moving device.

[0007] A flexible bag shape control device is also provided in the flexible bag, and the flexible bag shape control device is used to control the local protrusion and depression of the flexible bag.

[0008] The flexible bag shape control device is a tubular cavity attached to the surface of the bag body; the tubular cavity is generally arc-shaped and has a rectangular cross-section; the tubular cavity includes a first cavity and a second cavity that are staggered.

[0009] A partition is provided in the middle of the second cavity; the partition divides the second cavity into two small cavities on the left and right.

[0010] The fixing clamp is provided with a gas source connection hole connected with the first cavity and the second cavity; the first cavity and the second cavity are filled with gas.

[0011] One end of the air source connection hole is connected to the first cavity and the second cavity, and is interconnected with the internal cavity space of the first cavity and the second cavity, and the other end is connected to the air source; squeezing rollers are provided on both sides of the flexible bag, and the distance between the two squeezing rollers is fixed.

[0012] The tubular cavity is made of a high-temperature resistant flexible material; the outer wall of the tubular cavity is bonded to the inner surface of the bag body; the flexible bag shape control device includes a flexible tube arranged inside the flexible bag, the flexible tube is attached to the inner wall of the flexible bag, and the upper part is connected to the air source.

[0013] The flexible tube comprises a first flexible tube and a second flexible tube which are alternately arranged. The first flexible tube and the second flexible tube are used to pass gas and control the shape of the airbag by the gas pressure.

[0014] A partition is provided in the middle of the second flexible tube for blocking the second flexible tube so that the cavities of the second flexible tube on the left and right sides of the block are not connected.

[0015] The flexible bag adjusting device comprises squeezing rollers arranged on both sides of the middle of the flexible bag to squeeze the flexible bag.

[0016] The squeezing roller is cylindrical; an squeezing flat plate fixedly connected to the squeezing roller is provided on the upper part of the squeezing roller; the squeezing flat plate is located on the upper side of the squeezing roller and is arranged corresponding to the flexible bag located on the upper part of the squeezing roller; gears are provided at one end of the squeezing rollers on both sides of the flexible bag, and the two gears are meshed with each other; a drive motor is provided on the other side of the squeezing roller, and the drive motor is used to drive the rotation of the squeezing roller.

[0017] A method for placing a carbon fiber tape by a placing head of a placing machine, comprising:

[0018] S01: Scan the shape of the core mold to determine the surface curvature radius of the core mold;

[0019] S02: Setting the running trajectory, comparing the surface curvature radius of the core mold with the cross-sectional curvature radius of the bag body of the flexible bag located below the squeezing roller;

[0020] S03: When the placement head moves to a position with a small curvature radius, the inflation and deflation of the first cavity and the second cavity are controlled so that the surface of the flexible bag fits the surface of the core mold;

[0021] S04: Paving completed.

[0022] The step S02 includes the following steps:

[0023] S021: If the surface curvature radius of the core mold is smaller than the cross-sectional curvature radius of the bag body, execute S031; if the surface curvature radius of the core mold is larger than the cross-sectional curvature radius of the bag body, execute S032;

[0024] S022: Based on the operation of the placement head, the locations with smaller curvature radii are marked in sequence, labeled A1, A2, and so on.

[0025] S023: Based on the running trajectory and running speed of the placement head, calculate the time when the flexible bag reaches each position mark. During a placement process, the time when the edge of the flexible bag first touches the mark position is recorded as T1-A1, the time when the edge of the flexible bag last touches the mark position is recorded as T3-A1, and the time when the middle of the flexible bag touches the lowest or highest position of the mark position is recorded as T2-A1;

[0026] S024: Mark the first and second cavities of the flexible bag in order from left to right as QD1, QD2, QD3, etc.; the odd-numbered ones are the first cavities, and the even-numbered ones are the second cavities; the left cavity of the second cavity is marked as QD2L, and the right cavity is marked as QD2R.

[0027] The step S03 includes the following steps:

[0028] S031: The placement head runs according to the set trajectory. When the placement head runs outside the time of T1-A1 to T3-A3, the first cavity is inflated, that is, QD1, QD3, QD5... are inflated, and the second cavity is in a non-inflated state;

[0029] S032: During the time period T1-A1 to T2-A1, the right cavity QD2R of the second cavity is inflated, the left cavity is QD2L, and the first cavity is in a non-inflated state; at the same time, the position of the squeezing plate of the squeezing roller is controlled so that the squeezing plate is not squeezing the flexible bag;

[0030] S033: During the time period T2-A1 to T3-A1, the left cavity QD2L of the second cavity is inflated, while the right cavity QD2R and the first cavity are in a non-inflated state. Simultaneously, the position of the squeezing plate of the squeezing roller is controlled so that the squeezing plate is in a state of squeezing the flexible bag.

[0031] S034: When the width of the marked positions A1, A2, ... is smaller than the width of the flexible bag, the inflation and non-inflation states of the corresponding cavities QD1, QD2, QD3, ... are controlled according to the positions of the marked positions relative to the flexible bag.

[0032] The present invention provides a laying head for a carbon fiber tape laying machine, comprising a conveying device and a rolling device; the rolling device comprises at least one flexible rolling device; the flexible rolling device comprises an internal liquid flexible bag and a flexible bag adjustment device, the flexible bag adjustment device being capable of adjusting the shape and pressure of the contact portion between the flexible bag and the carbon fiber tape; the flexible rolling device being used to fix the fiber laying to a designated position. A laying method for the laying head of a carbon fiber tape laying machine is also provided. This design uses a flexible bag to replace a traditional laying roller. Compared to traditional laying rollers, the flexible bag can better adhere to the surface of a core mold. At the same time, the liquid inside the flexible bag can impart a certain toughness to the flexible bag, allowing the fiber tape to better adhere to the surface of the core mold. By adjusting the flexible bag moving device, the pressure between the flexible bag and the core mold can be controlled to ensure stable pressure during the laying of the fiber tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a simplified structural diagram of a placement head of a carbon fiber tape placement machine according to the present invention;

[0034] Figure 2 This is a front view of a rolling device of a placement head of a carbon fiber tape placement machine according to the present invention;

[0035] Figure 3 This is a right side view of a rolling device of a placement head of a carbon fiber tape placement machine according to the present invention;

[0036] Figure 4 This is a cross-sectional view of an AA section of a rolling device of a placement head of a carbon fiber tape placement machine according to the present invention;

[0037] Figure 5 A cross-sectional view of a flexible bag of a rolling device of a placement head of a carbon fiber tape placement machine according to the present invention;

[0038] Figure 6 A cross-sectional view of a flexible bag of a rolling device of a placement head of a carbon fiber tape placement machine according to the present invention;

[0039] Figure 7 This is a schematic diagram of the arrangement of the inner cavity channels of the flexible bag of the rolling device of the placement head of the carbon fiber tape placement machine of the present invention;

[0040] Figure 8 This is a schematic diagram of a rolling device of a placement head of a carbon fiber tape placement machine of the present invention placing a fiber tape on a plane;

[0041] Figure 9This is a schematic diagram of a rolling device of a placement head of a carbon fiber tape placement machine of the present invention placing a fiber tape at time points T1-A1 to T2-A1 at a marked position;

[0042] Figure 10 This is a schematic diagram of a carbon fiber tape placement machine of the present invention having a placement head rolling device placing fiber tapes at time points T2-A1 to T3-A1 at the marked position. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] Example 1:

[0045] Please see the attached Figure 1-10 , a laying head of a carbon fiber tape laying machine, which includes a conveying device and a rolling device;

[0046] The conveying device includes a guide wheel 1, a clamping module 2, a re-feeding module 3, a shearing module 4, and a heating module 5;

[0047] The fiber tape is sequentially conveyed to the rolling device through the guide wheel 1, the clamping module 2, the re-feeding module 3, the shearing module 4, and the heating module 5, and is then laid onto the core mold product through the rolling device;

[0048] The rolling device 6 includes: a fixed frame 61, a flexible bag 62, a flexible bag moving device 63, and a squeezing roller 64;

[0049] The fixing frame 61 includes a rectangular frame 611, which is composed of four steel plates. A moving device fixing plate 612 is provided on the upper portion of the rectangular frame 611;

[0050] The flexible bag moving device 63 is fixed on the moving device fixing plate 612;

[0051] The flexible bag moving device 63 is a push rod motor or a moving cylinder;

[0052] The flexible bag 62 is fixed on the output push rod of the flexible bag moving device 63;

[0053] The flexible bag 62 includes a fixing clip 621 , and the cross section of the fixing clip 621 is U-shaped;

[0054] The flexible bag 62 further includes a bag body 622;

[0055] The bag body 622 is strip-shaped and has a gourd-shaped cross section;

[0056] The bag body 622 is made of high-temperature resistant ceramic fiber cloth;

[0057] The bag 622 is filled with liquid;

[0058] The inner surface of the bag body 622 is provided with a control device for controlling the shape of the flexible bag;

[0059] The flexible bag shape control device is a tubular cavity 623 attached to the inner surface of the bag body 622;

[0060] The tubular cavity 623 is made of a high temperature resistant flexible material.

[0061] The outer wall of the tubular cavity 623 is bonded to the inner surface of the bag body 622;

[0062] The tubular cavity 623 is generally arc-shaped and has a rectangular cross section;

[0063] The tubular cavity 623 includes a first cavity 6231 and a second cavity 6232;

[0064] The first cavity 6231 and the second cavity 6232 are arranged alternately;

[0065] A partition 6233 is provided in the middle of the second cavity 6232;

[0066] The partition 6233 is a bonding point provided in the middle of the second cavity 6232;

[0067] The barrier 6233 divides the second cavity 6232 into two small cavities on the left and right;

[0068] The fixing clamp 621 is provided with an air source connection hole 6211 connected to the first cavity 6231 and the second cavity 6232;

[0069] The first cavity 6231 and the second cavity 6232 are filled with gas;

[0070] One end of the gas source connection hole 6211 is connected to the first cavity 6231 and the second cavity 6232, and the internal cavity spaces of the first cavity 6231 and the second cavity 6232 are interconnected, and the other end is connected to the gas source;

[0071] The flexible bag 62 is provided with squeezing rollers 64 on both sides, and the distance between the two squeezing rollers 64 is fixed;

[0072] The squeezing roller 64 is located in the middle of the bag body 622;

[0073] The squeezing roller 64 is cylindrical and hingedly mounted on the fixing frame 61 and arranged parallel to the fixing clamp 621;

[0074] The upper portion of the squeezing roller 64 is further provided with an squeezing flat plate 641;

[0075] The extrusion flat plate 641 is fixedly connected to the extrusion roller 64, and the plane of the extrusion flat plate 641 close to the flexible bag 62 is tangential to the extrusion roller 64;

[0076] The extrusion flat plate 641 is located on the upper side of the extrusion roller 64 and is arranged corresponding to the flexible bag 62 located on the upper part of the extrusion roller 64;

[0077] One end of the squeezing rollers 64 on both sides of the flexible bag 62 is provided with a gear 643, and the two gears 643 are meshed with each other;

[0078] A drive motor 642 is provided on the other side of the squeezing roller, and the drive motor 642 is used to drive the squeezing roller 64 to rotate.

[0079] Example 2:

[0080] Please see the attached Figure 1-10 A method for placing a carbon fiber tape by a placing head of a placing machine, comprising:

[0081] S01: Scan the shape of the core mold 8 to determine the surface curvature radius of the core mold;

[0082] S02: Setting the running trajectory, comparing the surface curvature radius of the core mold with the cross-sectional curvature radius of the bag body of the flexible bag 62 located below the squeezing roller 64;

[0083] S03: When the placement head moves to a position with a small curvature radius, the inflation and deflation of the first cavity 6231 and the second cavity 6232 are controlled so that the surface of the flexible bag 62 fits the surface of the core mold;

[0084] S04: Paving completed;

[0085] The step S02 includes the following steps:

[0086] S021: If the surface curvature radius of the core mold is smaller than the cross-sectional curvature radius of the bag body, execute S031; if the surface curvature radius of the core mold is larger than the cross-sectional curvature radius of the bag body, execute S032;

[0087] S022: Based on the operation of the placement head, the locations with smaller curvature radii are marked in sequence, labeled A1, A2, and so on.

[0088] S023: Based on the running trajectory and running speed of the placement head, calculate the time when the flexible bag reaches each position mark. During a placement process, the time when the edge of the flexible bag first touches the mark position is recorded as T1-A1, the time when the edge of the flexible bag last touches the mark position is recorded as T3-A1, and the time when the middle of the flexible bag touches the lowest or highest position of the mark position is recorded as T2-A1;

[0089] S024: Label the first and second lumens 6231 and 6232 of the flexible bag in order from left to right as QD1, QD2, QD3, etc., with odd numbers representing the first lumen 6231 and even numbers representing the second lumen 6232. Label the left lumen of the second lumen 6232 as QD2L and the right lumen as QD2R.

[0090] The step S03 includes the following steps:

[0091] S031: The placement head runs according to the set trajectory. When the placement head runs outside the time of T1-A1 to T3-A3, the first cavity 6231 is inflated, that is, QD1, QD3, QD5... are inflated, and the second cavity 6232 is in a non-inflated state;

[0092] S032: During the time period T1-A1 to T2-A1, the right cavity QD2R of the second cavity 6232 is inflated, the left cavity QD2L is inflated, and the first cavity 6231 is in a non-inflated state. Simultaneously, the position of the squeezing plate 641 of the squeezing roller 64 is controlled so that the squeezing plate 641 is not squeezing the flexible bag.

[0093] S033: During the time period T2-A1 to T3-A1, the left cavity QD2L of the second cavity 6232 is inflated, while the right cavity QD2R and the first cavity 6231 are in a non-inflated state. Simultaneously, the position of the squeezing plate 641 of the squeezing roller 64 is controlled so that the squeezing plate 641 is in a state of squeezing the flexible bag.

[0094] S034: When the width of the marked positions A1, A2, ... is smaller than the width of the flexible bag, the inflation and non-inflation states of the corresponding cavities QD1, QD2, QD3, ... are controlled according to the positions of the marked positions relative to the flexible bag.

[0095] During use, this design uses a flexible bag to replace the traditional laying roller. Compared with the traditional laying roller, the flexible bag can better fit the surface of the core mold. At the same time, the liquid inside the flexible bag can make the flexible bag have a certain toughness, so that the fiber belt can better fit the surface of the core mold. By adjusting the flexible bag moving device 63, the pressure between the flexible bag and the core mold can be controlled to ensure stable pressure during the laying process of the fiber belt.

Claims

1. A placement head for a carbon fiber tape placement machine, characterized in that: It includes a conveying device and a rolling device; the rolling device includes at least one flexible rolling device; the flexible rolling device includes an internal liquid flexible bag and a flexible bag adjustment device, the flexible bag adjustment device can adjust the shape and pressure of the contact part between the flexible bag and the fiber belt; the flexible rolling device is used to lay and fix the fiber to a specified position; The flexible bag has a strip-shaped body and a gourd-shaped longitudinal section; the upper portion is fixed on a fixing clamp; the fixing clamp is installed at the output end of the flexible bag moving device; The flexible bag is further provided with a flexible bag shape control device, and the flexible bag shape control device is used to control the local protrusion and depression of the flexible bag; The flexible bag shape control device is a tubular cavity attached to the surface of the bag body; the tubular cavity is generally arc-shaped, and the vertical cross-section is rectangular; the tubular cavity includes a first cavity and a second cavity arranged alternately; A barrier is provided in the middle of the second cavity; the barrier divides the second cavity into two small cavities on the left and right.

2. A placement head for a carbon fiber tape placement machine according to claim 1, characterized in that: The fixing clamp is provided with a gas source connection hole connected with the first cavity and the second cavity; the first cavity and the second cavity are filled with gas.

3. A placement head for a carbon fiber tape placement machine according to claim 2, characterized in that: One end of the air source connection hole is connected to the first cavity and the second cavity, and is interconnected with the internal cavity space of the first cavity and the second cavity, and the other end is connected to the air source; squeezing rollers are provided on both sides of the flexible bag, and the distance between the two squeezing rollers is fixed.

4. A placement head for a carbon fiber tape placement machine according to claim 3, characterized in that: The tubular cavity is made of a high-temperature resistant flexible material; the outer wall of the tubular cavity is bonded to the inner surface of the bag body; the flexible bag shape control device includes a flexible tube arranged inside the flexible bag, the flexible tube is attached to the inner wall of the flexible bag, and the upper part is connected to the air source.

5. The placement head of a carbon fiber tape placement machine according to claim 4, characterized in that: The flexible tube comprises a first flexible tube and a second flexible tube which are alternately arranged. The first flexible tube and the second flexible tube are used to pass gas and control the shape of the airbag by the gas pressure.

6. A placement head for a carbon fiber tape placement machine according to claim 5, characterized in that: A barrier is provided in the middle of the second flexible tube for blocking the second flexible tube so that the cavities of the second flexible tube on the left and right sides of the barrier are not connected.

7. A placement head for a carbon fiber tape placement machine according to claim 6, characterized in that: The flexible bag adjusting device comprises squeezing rollers arranged on both sides of the middle of the flexible bag and the squeezing flexible bag.

8. The placement head of a carbon fiber tape placement machine according to claim 7, characterized in that: The squeezing roller is cylindrical; an squeezing flat plate fixedly connected to the squeezing roller is provided on the upper part of the squeezing roller; the squeezing flat plate is located on the upper side of the squeezing roller and is arranged corresponding to the flexible bag located on the upper part of the squeezing roller; gears are provided at one end of the squeezing rollers on both sides of the flexible bag, and the two gears are meshed with each other; a drive motor is provided on the other side of the squeezing roller, and the drive motor is used to drive the rotation of the squeezing roller.

9. A method for placing a carbon fiber tape using a placement head of a placement machine, characterized in that: The placement head is a placement head of a carbon fiber tape placement machine according to claim 1, which comprises: S01: Scan the shape of the core mold to determine the surface curvature radius of the core mold; S02: Setting the running trajectory, comparing the surface curvature radius of the core mold with the cross-sectional curvature radius of the bag body of the flexible bag located below the squeezing roller; S03: When the placement head moves to a position with a small curvature radius, the inflation and deflation of the first cavity and the second cavity are controlled so that the surface of the flexible bag fits the surface of the core mold; S04: Paving completed.

10. The method for placing a carbon fiber tape using a placement head of a carbon fiber tape placement machine according to claim 9, wherein: The step S02 includes the following steps: S021: If the surface curvature radius of the core mold is smaller than the cross-sectional curvature radius of the bag body, execute S031; if the surface curvature radius of the core mold is larger than the cross-sectional curvature radius of the bag body, execute S032; S022: Based on the operation of the placement head, the locations with smaller curvature radii are marked in sequence, labeled A1, A2, and so on. S023: Based on the running trajectory and running speed of the placement head, calculate the time when the flexible bag reaches each position mark. During a placement process, the time when the edge of the flexible bag first touches the mark position is recorded as T1-A1, the time when the edge of the flexible bag last touches the mark position is recorded as T3-A1, and the time when the middle of the flexible bag touches the lowest or highest position of the mark position is recorded as T2-A1; S024: Mark the first and second cavities of the flexible bag from left to right as QD1, QD2, QD3, etc.; The odd-numbered ones are the first cavity, and the even-numbered ones are the second cavity; the left cavity of the second cavity is denoted as QD2L, and the right cavity is denoted as QD2R.

11. The method for placing a carbon fiber tape using a placement head of a carbon fiber tape placement machine according to claim 10, wherein: The step S03 includes the following steps: S031: The placement head runs according to the set trajectory. When the placement head runs outside the time of T1-A1 to T3-A3, the first cavity is inflated, that is, QD1, QD3, QD5... are inflated, and the second cavity is in a non-inflated state; S032: During the time period T1-A1 to T2-A1, the right cavity QD2R of the second cavity is inflated, the left cavity is QD2L, and the first cavity is in a non-inflated state; at the same time, the position of the squeezing plate of the squeezing roller is controlled so that the squeezing plate is not squeezing the flexible bag; S033: During the time period T2-A1 to T3-A1, the left cavity QD2L of the second cavity is inflated, while the right cavity QD2R and the first cavity are in a non-inflated state. Simultaneously, the position of the squeezing plate of the squeezing roller is controlled so that the squeezing plate is in a state of squeezing the flexible bag. S034: When the width of the marked positions A1, A2, ... is smaller than the width of the flexible bag, the inflation and non-inflation states of the corresponding cavities QD1, QD2, QD3, ... are controlled according to the positions of the marked positions relative to the flexible bag.

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